vacuum advance ported vs manifold source

Chuckman

Chuckman

Well-Known Member
Joined
Oct 9, 2005
Location
Huntersville
Ok fellas, I dont seen to have a ported vac source available on my '70 chevy 307 V8- 2 barrel Rochester. Is this possible? Does it adjust timing even at idle? If you are knowlegable enough to answer this, then what is base timing and do I set it with this vac line connected to the dizzy? This was an engine swap in a Willys that I just got and when I was poking around, I noticed that it was hooked to a manifold vac source.:popcorn: Can this be right? -it seems to run ok.
 
http://en.wikipedia.org/wiki/Ignition_timing

there are a few links to other info as well.

lots of variables that really prevent giving the "right" answer, dependant on what your engine set up is.

I know I would start out with 8°-10° base timing and play with it from there.
 
read the link voodoo posted it covers it all. You need ported vacuume it will be a tube above the base plate. Timing ya try 8-10

But I'm probably not knowledgable enough.. :flipoff2:
 
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